MMM, I would do nothing but take turns sniffing out their respective pussies here!

Here's an odor type anticipation description:
how
1. Nel: I'd expect her to have a slightly sweet piss odor, likely light and musty.

2. Tatsuki: I'd likely be be getting a strong, musty piss stink mixed with some crotch-sweat, she seems the type who hardly wipes due to her athletic activities.

3. Yoruichi: She must have that sharp, Swiss cheesy piss stink mixed with spandex due to her typical attire of stretch pants(she must be quite stinky since she's likely spent days in the field on missions).

4. Harribel: I'd likely get that sharp, sour natural piss stink(due to her likely being a virgin).

I'd also get some of their respective ass odor/stink AND that musty coppery odor courtesy of their periods! I'd be creaming my self silly from their respective feminine/hygienic odors, I'd also take any tampons they may have plugging their snatches for later sniffing..............